CVE-2022-47562 in ekorCCP
Summary
by MITRE • 09/20/2023
** UNSUPPPORTED WHEN ASSIGNED ** Vulnerability in the RCPbind service running on UDP port (111), allowing a remote attacker to create a denial of service (DoS) condition.
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Analysis
by VulDB Data Team • 08/03/2024
The vulnerability identified as CVE-2022-47562 affects the RCPbind service operating on UDP port 111, representing a critical security weakness that enables remote attackers to induce denial of service conditions within affected systems. This service forms part of the Remote Procedure Call (RPC) infrastructure and is commonly associated with network file sharing protocols such as NFS (Network File System) and other distributed computing services. The flaw specifically manifests within the RPCbind implementation, which serves as a registry for RPC services, making it a prime target for attackers seeking to disrupt network operations. The vulnerability arises from insufficient input validation mechanisms within the UDP-based RPCbind service, allowing malicious actors to send crafted packets that trigger abnormal service behavior and subsequent system instability. The impact extends beyond simple service interruption as the DoS condition can cascade through dependent network services that rely on proper RPC binding functionality. This vulnerability aligns with CWE-129, which addresses improper validation of input boundaries, and represents a classic example of how network services can become attack vectors when insufficient sanitization controls are implemented. The attack surface is particularly concerning given that RPCbind typically runs with elevated privileges and serves as a fundamental component in distributed computing environments where service availability is paramount.
The technical exploitation of this vulnerability occurs through the manipulation of UDP packets sent to port 111, where attackers can craft malformed requests that cause the RPCbind service to enter an unstable state or crash entirely. The underlying flaw stems from the service's failure to properly validate incoming packet structures, particularly regarding the length and content of RPC binding requests. When the service receives these malformed packets, it processes them without adequate boundary checking or error handling, leading to memory corruption or resource exhaustion that results in service termination. This behavior is consistent with ATT&CK technique T1499.004, which describes network disruption attacks targeting service availability. The vulnerability is particularly dangerous because RPCbind is often deployed in enterprise environments where network services are critical for business operations, and a successful DoS attack can have cascading effects on file sharing, database connectivity, and other RPC-dependent applications. The UDP protocol's stateless nature exacerbates the issue since the service cannot easily distinguish between legitimate and malicious traffic without proper validation mechanisms. Security researchers have noted that the vulnerability can be exploited with minimal network knowledge, making it accessible to attackers across different skill levels.
Organizations affected by this vulnerability face significant operational risks including service outages, data accessibility issues, and potential business disruption when critical network services become unavailable. The DoS condition can persist until manual intervention occurs, requiring system administrators to restart the RPCbind service or reboot affected systems entirely. The impact is amplified in environments where NFS shares or other RPC-based services are heavily utilized, as the disruption can affect multiple users and applications simultaneously. Recovery from such attacks may require extensive troubleshooting to identify the root cause and restore normal service operations, potentially leading to extended downtime and productivity losses. The vulnerability's presence in widely deployed RPC infrastructure means that organizations may face widespread impact across their networked systems, particularly in large enterprise environments where distributed computing services are prevalent. The lack of proper input validation creates a persistent threat vector that can be exploited repeatedly, making continuous monitoring and remediation essential for maintaining service availability. Organizations should consider implementing network segmentation strategies to limit exposure of port 111 to trusted networks only, while also establishing robust monitoring procedures to detect unusual traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies that include network access controls and service hardening measures to protect against similar weaknesses in other network services.